| The perparation and modification of the waterbrone epoxy curing agents is investigated in this paper. Part one is about the low viscosity waterbrone epoxy curing agents'synthetsize without acetic acid. Part two is about the nano-alumina modified epoxy curing agents. The project has a theoretical significance and a good prospect.The optimal synthesis technology was developed by conversion rate and coating's performance test . The molecular structure was determined by FT-IR and the thermostabilization was researched by TG. A TMPEG-TETA adduct is prepared from trimethylolpropane triglycidyl ether (TMPEG) and Triethylene-tetramine (TETA) in the molar ratio TMPEG/TETA 6:1, at the 60℃reacting for 3 h, then the TMPEG-TETA adduct reacting with epoxy(EP), and finally the low viscosity water-solubility curing agent was gained by the crestion in which secondary amine was closed by phenyl glycidyl ether at the same reaction condition. The cured film cured at room temperature has a good glossiness, hardness, adhesion and good resistance to impact. The mixed amines and amino siloxane modified epoxy curing agents were studied. 2,2,4-methyl-hexanediamine and TETA equivalent mixed-use increased the cured film's synthetic characteristics. M-Xylylenediamine and TETA equivalent mixed-use improved the cured film's hardness, and appropriate amine silicone improved the cured film's glossiness.The method of dispersing 20nm nanoγ-Al2O3 in waterborne epoxy curingagent evenly was studied in the paper. Nanoγ-Al2O3 was supersonic dispersed one hour after siloxane pretreatment, then high-speed scattered four hours with waterborne curing agent. The performance test, particle size analysis and SEM observation show that the nanoγ-Al2O3 particles were decentralized uniformly.And the impact resistance, hardness and wearability have been enhanced when the content of nanoγ-Al2O3 were <0.1%, the wearability was decreased as the quantity of the nanoγ-Al2O3 particles was increased. |
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